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	<h2> 提交记录 7037 </h2>
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					<th class="col-xs-2"> 用户 </th>
					<th class="col-xs-3"> 题目 </th>
					<th class="col-xs-2"> 状态 </th>
					<th class="col-xs-1"> 得分 </th>
					<th class="col-xs-1"> 用时 </th>
					<th class="col-xs-1"> 内存 </th>
					<th class="col-xs-1"> 语言 </th>
					<th class="col-xs-1"> 代码长度 </th>
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					<td style='font-size:13px'> <a href='/user/profile/weng_weijie/index.html'> weng_weijie </a> </td>
<td> <a href='/problem/1002/index.html'> 1002. 测测你的多项式乘法 </a> </td>
<td> Accepted </td>
<td> 100 </td>
<td style='font-size:13px'> 1.354 s </td>
<td style='font-size:13px'> 39 MB + 672 KB </td>
<td style='font-size:13px'> C++11 </td>
<td style='font-size:13px'> 1.47 KB </td>
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					<th class="col-xs-6"> 提交时间 </th>
					<th class="col-xs-6"> 评测时间 </th>
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					<td style='font-size:13px'> 2018-12-10 17:01:32 </td>
<td style='font-size:13px'> 2019-01-19 16:21:03 </td>
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				<label for="code"> 代码 </label>
				<pre style="background-color:white"><code class="cpp">#include &lt;algorithm&gt;

using LL = long long;

const int mod = 998244353;
const int N = 1 &lt;&lt; 21;

int rev[N], wn[N + 1], lim, s;

int pow(int x, int y) {
	int ans = 1;
	for (; y; y &gt;&gt;= 1, x = static_cast&lt;LL&gt; (x) * x % mod)
		if (y &amp; 1) ans = static_cast&lt;LL&gt; (ans) * x % mod;
	return ans;
}

void fftinit(int len) {
	lim = 1, s = -1;
	while (lim &lt; len)
		lim &lt;&lt;= 1, s++;
	for (int i = 0; i &lt; lim; i++)
		rev[i] = rev[i &gt;&gt; 1] &gt;&gt; 1 | (i &amp; 1) &lt;&lt; s;
	wn[0] = 1;
	const int g = pow(3, (mod - 1) / lim);
	for (int i = 1; i &lt;= lim; i++)
		wn[i] = static_cast&lt;LL&gt; (wn[i - 1]) * g % mod;
}

void reduce(int &amp;x) {
	x += x &gt;&gt; 31 &amp; mod;
}

void fft(int *A, int typ) {
	for (int i = 0; i &lt; lim; i++)
		if (i &lt; rev[i])
			std::swap(A[i], A[rev[i]]);
	for (int i = 1; i &lt; lim; i &lt;&lt;= 1) {
		const int t = lim / i / 2;
		for (int j = 0; j &lt; lim; j += i &lt;&lt; 1)
			for (int k = 0; k &lt; i; k++) {
				const int x = A[k + j], y = static_cast&lt;LL&gt; (A[k + j + i]) * wn[typ ? t * k : lim - t * k] % mod;
				reduce(A[k + j] += y - mod), reduce(A[k + j + i] = x - y);
			}
	}
	if (!typ) {
		const int ilim = pow(lim, mod - 2);
		for (int i = 0; i &lt; lim; i++)
			A[i] = static_cast&lt;LL&gt; (A[i]) * ilim % mod;
	}
}

int tA[N], tB[N];

void poly_multiply(unsigned *a, int n, unsigned *b, int m, unsigned *c) {
	fftinit(n + m + 1);
	std::copy(a, a + n + 1, tA), std::copy(b, b + m + 1, tB);
	fft(tA, 1), fft(tB, 1);
	for (int i = 0; i &lt; lim; i++)
		tA[i] = static_cast&lt;LL&gt; (tA[i]) * tB[i] % mod;
	fft(tA, 0);
	std::copy(tA, tA + n + m + 1, c);
}</code></pre>
				<br />
				
				<label for="result"> 评测结果 </label><div class="row"><div class="col-xs-12"><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Compilation</b></td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">Compile OK</td><td class="col-xs-2" style="vertical-align:middle">Score: N/A</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_1" aria-expanded="false" aria-controls="detail_1">显示更多</a></td></tr></table></div><div class="collapse" id="detail_1"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>Compiling...
Compile success!
</textarea></div></div><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Testcase #1</b></td><td class="col-xs-2" style="vertical-align:middle">1.354 s</td><td class="col-xs-2" style="vertical-align:middle">39 MB + 672 KB</td><td class="col-xs-2" style="vertical-align:middle">Accepted</td><td class="col-xs-2" style="vertical-align:middle">Score: 100</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_2" aria-expanded="false" aria-controls="detail_2">显示更多</a></td></tr></table></div><div class="collapse" id="detail_2"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>verdict = Run Finished
time_ms = 1354.183729
mem_kb = 40608
Correct Answer
</textarea></div></div></div></div>
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